1 /* 2 * Copyright (C) 2008 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.testing; 18 19 import junit.framework.TestCase; 20 21 import java.util.logging.Level; 22 import java.util.logging.LogRecord; 23 import java.util.logging.Logger; 24 25 /** 26 * Unit test for {@link TestLogHandler}. 27 * 28 * @author kevinb 29 */ 30 public class TestLogHandlerTest extends TestCase { 31 32 private TestLogHandler handler; 33 private TearDownStack stack = new TearDownStack(); 34 setUp()35 @Override protected void setUp() throws Exception { 36 super.setUp(); 37 38 handler = new TestLogHandler(); 39 40 // You could also apply it higher up the Logger hierarchy than this 41 ExampleClassUnderTest.logger.addHandler(handler); 42 43 ExampleClassUnderTest.logger.setUseParentHandlers(false); // optional 44 45 stack.addTearDown(new TearDown() { 46 @Override 47 public void tearDown() throws Exception { 48 ExampleClassUnderTest.logger.setUseParentHandlers(true); 49 ExampleClassUnderTest.logger.removeHandler(handler); 50 } 51 }); 52 } 53 test()54 public void test() throws Exception { 55 assertTrue(handler.getStoredLogRecords().isEmpty()); 56 ExampleClassUnderTest.foo(); 57 LogRecord record = handler.getStoredLogRecords().get(0); 58 assertEquals(Level.INFO, record.getLevel()); 59 assertEquals("message", record.getMessage()); 60 assertSame(EXCEPTION, record.getThrown()); 61 } 62 testConcurrentModification()63 public void testConcurrentModification() throws Exception { 64 // Tests for the absence of a bug where logging while iterating over the 65 // stored log records causes a ConcurrentModificationException 66 assertTrue(handler.getStoredLogRecords().isEmpty()); 67 ExampleClassUnderTest.foo(); 68 ExampleClassUnderTest.foo(); 69 for (LogRecord unused : handler.getStoredLogRecords()) { 70 ExampleClassUnderTest.foo(); 71 } 72 } 73 runBare()74 @Override public final void runBare() throws Throwable { 75 try { 76 setUp(); 77 runTest(); 78 } finally { 79 tearDown(); 80 } 81 } 82 tearDown()83 @Override protected void tearDown() { 84 stack.runTearDown(); 85 } 86 87 static final Exception EXCEPTION = new Exception(); 88 89 static class ExampleClassUnderTest { 90 static final Logger logger 91 = Logger.getLogger(ExampleClassUnderTest.class.getName()); 92 foo()93 static void foo() { 94 logger.log(Level.INFO, "message", EXCEPTION); 95 } 96 } 97 } 98